截取特定窗口的截图 - C++/Qt

#include <QApplication>
#include <QScreen>
#include <QPixmap>
#include <QWindow>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // 获取屏幕
    QScreen *screen = QGuiApplication::primaryScreen();

    // 获取屏幕的大小
    QRect screenGeometry = screen->geometry();

    // 获取需要截图的窗口
    QWindow *window = QApplication::topLevelWindows().first();

    // 获取窗口的大小和位置
    QRect windowGeometry = window->geometry();

    // 计算窗口相对于屏幕的位置
    QPoint offset = windowGeometry.topLeft();
    offset.rx() -= screenGeometry.left();
    offset.ry() -= screenGeometry.top();

    // 获取屏幕上的图像
    QPixmap screenPixmap = screen->grabWindow(0);

    // 截取窗口的图像
    QPixmap windowPixmap = screenPixmap.copy(offset.x(), offset.y(), windowGeometry.width(), windowGeometry.height());

    // 保存截图
    windowPixmap.save("window.png");

    return 0;
}